Nomenclature Atop = cross-sectional area of a spherewith volume equivalent to the balloon, m CD = drag coefficient; 0.5 cf = specific heat of the balloon film; 2302.7 J ⋅ kg−1 ⋅ K−1 cpg = specific heat of the balloon lifting gas (hydrogen); 14;320.0 J ⋅ kg−1 ⋅ K−1 g = Earth gravitational acceleration; 9.81 m ⋅ s−2 Ma = molecular weight of air; 28.96 kg ⋅ kmol−1 Mg = molecular weight of the gas (hydrogen); 2.02 kg ⋅ kmol−1 mf = mass of the balloon film; 100 kg mg = mass of the balloon gas, kg mtot = total mass of the system, kg mv = virtual mass, kg _ qf = net heat flux to the balloon film, W _ qg = net heat flux to the balloon gas, W Tf = balloon film temperature, K Tg = balloon gas temperature, K t = time, s V = volume of gas, m z = altitude of balloon, m ρa = density of air, kg ⋅m−3

中文翻译：

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模拟零压力气球的垂直运动

命名法 Atop = 体积相当于气球的球体的横截面积，m CD = 阻力系数；0.5 cf = 气球膜的比热；2302.7 J ⋅ kg−1 ⋅ K−1 cpg = 气球升力气体（氢气）的比热；14;320.0 J ⋅ kg−1 ⋅ K−1 g = 地球重力加速度；9.81 m ⋅ s−2 Ma = 空气的分子量；28.96 kg ⋅ kmol−1 Mg = 气体（氢）的分子量；2.02 kg ⋅ kmol−1 mf = 气球膜的质量；100 kg mg = 气球气体的质量，kg mtot = 系统的总质量，kg mv = 虚拟质量，kg _ qf = 气球膜的净热通量，W _ qg = 气球气体的净热通量，W Tf = 气球膜温度，K Tg = 气球气体温度，K t = 时间，s V = 气体体积，mz = 气球高度，m ρa = 空气密度，kg ⋅m−3